Watchmaker&#39;s tool



Feb. 11, l

E, F. WILTON 233L331 WATCHMAKER'S TOOL Filed July 15, 1940 f1 j INVENTCR z; fame A WA -W Patented Feb. 11, 1941 U ITED STATES PATENT error I 4 Glaims.

This invention relates toimprovements in watchmakers tools and has reference more particularly to a tool for use in inserting the jewel in the-roller table of an escapement.

Inthe manufacture and repair of watches having lever escapements, it is quite frequently necessary to replace the jewel or impulse pin in the roller table. Due to the small size of the roller table and of the jewel it is obviously very difiioult to insert a new jewel as the same must be held in. a predetermined position in an opening until secured thereto by means of shellac and heat.

It is the object of this invention to produce a tool especially designed for use in the operation of inserting and shellacking in place impulse pins orjewels on roller tables.

This invention, briefly described, comprises a tool made in the general shape of a pair of tweezers in which the two jaw members are formed from resilient material and biased to spaced relation. Means is provided for moving them towards each other and one ofthe jaws has a conical pin that will fit the opening in a roller 25 table and hold the latter in a predetermined position relative tothe jaw. The other jaw isand heat is transmitted to the assembly in sufii- I cient intensity to melt the shellac;

Having thus briefly described the invention, the same will now be described in detail, and for this purpose reference will be had to the accompanying drawing in which the invention has been illustrated in its preferred form, and in which:

Figure 1 is a perspective view of the tool that forms the subject of this invention;

Figure 2- is a bottom plan view thereof;

Figure 3 is a side elevation looking in the direction of arrows 3-3, in Figure 1, the parts be- 45 ing shown to an enlarged scale;

Figure 4 is a section taken on line 4-4, Figure 1;

Figure 5 is a top plan view looking in the direction of arrows 5-5, in Figure 1;

Figure 6 is a perspective view of a roller table showing the impulse pin or jewel in position; and

Figure 7 is a section similar to that shown in Figure 4, but to a somewhat larger scale.

The tool which forms the subject of this inventioncomprises two jaw members I!) and II which are preferably made from steel, but which may be made from any other suitable material. These jaw members have been shown as secured to a shank l2 by means of screws or bolts l3. 5 The jaws may be spotwelded or brazed to the shank 12, if desired. The shank [2 serves as a spacer and the jaw members are made of resilient material and biased tospaced relation. A screw (4 extends through an opening in jaw 10 member Ill and has a threaded connection with jaw member II and therefore whenever this screw is turned, the jaw members can be moved towards each other or away from each other. Since the jaws are biased to spaced relation, they 15 will move apart when the screw is turned in a direction to permit this motion; Jaw member I I is provided with an angular portion IE to which a piece of copper 561 has been secured by means of rivets IT. The function of this extension will 20 be hereinafter explained. In the embodiment illustrated, jaw it projects a short distance beyond the jaw l I and this extension has been designated by reference numeral l8. An arm [9 is pivotally connected to the outside surface of jaw It by means of a screw 20. A curved spring plate 2| is positioned between the head of the screw and the outer surface of the jaw so as to maintain a yielding pressure against the outer surfaceoi arm l9. Arm It can be turned about the screw 20 and moved from the position shown in Figure 1 to that shown in Figure 2. The free end of arm I9 is provided with a lateral extension 22 that has welded thereto an elongated hub 23. This hub is provided with a threaded opening for the'reception of a screw 24 whose upper end is enlarged to form an abutment 25. This screw can be rotated by means of the head 26 and the abutment 25 willimove up or down in accordance with the direction of rotation.

Referring now more particularly to Figure 7, it will be seen that jaw I0 is provided on its upper surface with a conical projection 27 that serves as a positioning means for a roller table 28 which has been shown in section in Figure 7 and in perspective in Figure 6. The roller table shown in Figure 6 is greatly enlarged and comprises a central cylindrical portion 29 having a circular flange 30 at its upper end and a smaller circular flange" 3| at its lower end. A central opening 32 extends entirely through the roller table. The flange 3! has a notch 33 and directly above this an opening 34 is provided in the flange 30. Opening 34 is substantially semicircular and receives the impulse pin or jewel 35 which is held in til place by means of shellac that is applied thereto and heated until it melts and flows into the space between the pin and the side of the opening. The edge of jaw I I has a notch 36 positioned directly above the conical projection 21 which provides an enlarged space about the opening 34 so as to facilitate theinsertion of the impulse pin.

Let us now assume that it is desired to insert a jewel or impulse pin 35 in the hole 34 of a roller table. The watchmaker will first open the jaws of the tool sufiiciently to permit the roller table to be inserted between them and positioned with its opening 32 over the conical positioning pin 21. The table is adjusted to bring the opening 34 towards the outside as shown in Figures 4, and. 7. Screw I4 is now rotated to bring the jaws together, whereupon the roller table is securely clamped in position. The screw 24 is now turned so as to bring the abutment 25 into position beneath the opening 34 and to a height which determines the position of the lower end of the impulse pin. The jewel is now inserted intothe opening and allowed to rest on the abutment 25, after which a small piece of shellac is put into position on the upper surface of the roller table and when this is done, the projection It is moved into the flame of a gas or alcohol burner, whereupon heat will be transferred by conduction to the roller table. The tool is held in operative relation to the flame until the shellac has melted, whereupon it is removed and the parts permitted to 0001.

An inspection of Figure 7 will show that by means of this tool, impulse pins can be readily ":found that it required a great amount of experience and dexterity to hold the pin from moving during the heating operation.

In the above embodiment, a screw [4 has been shown as the means for moving the jaws l0 and II towards each other, but this is merely illustrative of means for this purpose and can be replaced by any other equivalent means, such as a cam. A tool is provided with a handle 31 of suitable material which should preferably be a .poor heat conductor.

In the above description and on the drawing, a specific embodiment has been described and illustrated, but it is evident that minor changes may be resorted to without departing from the invention and applicant therefore reserves the right to make such changes as fall within the scope of the appending claims.

Having described the invention, what is claimed as new is:

1. A watchmakers tool comprising two jaws of resilient material attached to each other at one end and biased to spaced relation, means for moving the jaws towards each other to clamp between them a roller table having a flange provided with an opening for the reception of a jewel, one of the jaws having a threaded opening, a threaded jewel abutment in the opening, said abutment being adjustable by a rotary motion, and means for positioning the roller table in a predetermined relation to the abutment.

2. A watchmakers tool for use in positioning a jewel in a roller table of an escapement mechanism, comprising in combination, two jaws of resilient material attached to each other at one end and biased to spaced relation, means for moving the jaws towards each other to clamp between them a roller table having a flange provided with an opening for the reception of a jewel, one of the jaws having means for positioning the roller table in a perdetermined position relative thereto, an arm pivotally attached to the jaw member having the positioning means, said arm having a threaded opening, and a screw in the opening, the end of the screw forming an abutment for a jewel, the abutment surface being adjustable by a rotary movement of the screw.

3. A watchmakers tool for use in positioning a jewel in a roller table of an escapement mechanism, comprising in combination, two jaws of resilient material attached to each other at one end and biased to spaced relation, means for moving the jaws towards each other to clamp between them a roller table having a flange provided with an opening for the reception of a jewel, one of the jaws having means for positioning the table in a predetermined position relative thereto, the last named jaw having a lateral extension provided with a threaded opening, a screw positioned in the opening and operatively associated with the threads, the end of the screw serving as an abutment for a jewel to hold the same while it is secured in position by shellac.

- 4. A watchmakers tool for use in positioning a jewel impulse pin in a roller table of an escapement mechanism, comprising in combination, a pair of resilient jaws secured to each other at one end and biased to spaced relation, means for moving the jaws towards each other to clamp between them a roller table, means on one jaw for positioning a roller table in a predetermined position thereon, an arm pivoted to the last mentioned jaw, means for urging the arm towards the jaw comprising a screw and a spring, the movable end of the jaw having a threaded opening, and a threaded jewel abutment member operatively positioned in the opening.

EDGAR F. WILTON. 

